Abstract

A novel two-dimensional (2D) material member in the transition metal dichalcogenides family, few-layered rhenium disulfide (${\mathrm{ReS}}_2$) was prepared by liquid phase method successfully. By using the open-aperture Z-scan method, the saturable absorption properties at 2.8 μm were characterized with a saturable fluence of $22.6\mathrm{\mu J}/{\mathrm{cm}}^2$ and a modulation depth of 9.7%. A passively $Q$-switched solid-state laser at 2.8 μm was demonstrated by using the as-prepared ${\mathrm{ReS}}_2$ saturable absorber successfully. Under an absorbed pump power of 920 mW, a maximum output power of 104 mW was obtained with a pulse width of 324 ns and a repetition rate of 126 kHz. To the best of our knowledge, this is the first demonstration of applying ${\mathrm{ReS}}_2$ in an all-solid-state laser. Moreover, this represents the shortest pulses in $Q$-switched MIR lasers based on a 2D material as the saturable absorber, which demonstrated the superiority of ${\mathrm{ReS}}_2$ acting as an optical modulator for generating short-pulsed lasers. The results well prove that 2D ${\mathrm{ReS}}_2$ is a reliable optical modulator for MIR solid-state lasers.

© 2017 Optical Society of America

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